Heat spells are incantations used to magically heat objects. They are elemental spells related to fire spells.

The known heat spells have been used in these occasions:

• Ahatian, used by Merlin to heat the sword of a bandit, forcing him to drop it and then killing him (The Moment of Truth).
• Forbaernan, by Merlin, unnoticed, to heat the knife that Aredian was holding at Morgana's throat. Merlin had used this incantation in several occasions as a fire spell (The Witchfinder).
• Onhǽte þá wæter, to make Arthur's bath water warmer. However, the spell was too powerful and the water became boiling hot (The Lady of the Lake).
• Non-verbally, by Gilli to win the semifinal match in the tournament, making his opponent drop his weapon (The Sorcerer's Shadow).
• Non-verbally, by Merlin. He cast a form of heat spell on Excalibur so that he could embed it in a stone in the middle of a forest (The Coming of Arthur: Part Two). The young warlock also seemed to have heated the stone when he freed the sword for Arthur (The Sword in the Stone: Part Two).
• The enchantment Merlin put on his pentacle for necromancy made it glow as if it was heated (Lancelot du Lac).
• The spell cast to copy a page used by Morgana had the effect of heating the page the Witch "printed" on a piece of cloth (The Hunter's Heart).

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